In [1]: import pandas as pd In [2]: pd.__version__ Out[2]: '0.20.0rc1' In [3]: df = pd.DataFrame({'int': [1, 2, 3, 4], ...: 'float': [1., 2., 3., 4.], ...: 'str': ['a', 'b', 'c', 'd']}) In [4]: df.mean() Out[4]: float 2.5 int 2.5 dtype: float64 In [5]: df.std() Out[5]: Series([], dtype: float64) In [6]: df.var() Out[6]: Series([], dtype: float64)